Phonet: allocate a non-Ethernet ARP type

Also leave some room for more 802.11 types.

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/if_arp.h b/include/linux/if_arp.h
index 4d34018..11df77a 100644
--- a/include/linux/if_arp.h
+++ b/include/linux/if_arp.h
@@ -87,6 +87,8 @@
 #define ARPHRD_IEEE80211_PRISM 802	/* IEEE 802.11 + Prism2 header  */
 #define ARPHRD_IEEE80211_RADIOTAP 803	/* IEEE 802.11 + radiotap header */
 
+#define ARPHRD_PHONET	820		/* PhoNet media type		*/
+
 #define ARPHRD_VOID	  0xFFFF	/* Void type, nothing is known */
 #define ARPHRD_NONE	  0xFFFE	/* zero header length */